I have had an intermittent problem where I am unable to open
attachments (JPG files) when using Vista mail. This started after I
upgraded to IE8. I am running Vista Ultimate x64 and Avast security.
The error message I get is "Windows cannot find xxx.jpg"

The last 3 times this happened I was able to solve the problem by
deleteing my temporary internet files. Once I did that I was able to
open the attached JPG file. The problem keeps reoccuring however.